Metal binding



E. E. DRAPER METAL BINDING March 23, 1933.

Filed March 29, 1950 PIC-3.3

/IIIIIIIIIIIIII' f 1 1 s i 4 III III I U I Patented Mar. 21, 1933 UNITED STATES PATENT OFF-ICE- ERNEST n. DBAI'EB, or scAns'nALE, NEW YORK, AssIcNOa "r THE rnnsnn conrO-.

- RATION, or New YORK, N. Y., A CORPORATION OF NEW YORK mar. BINDING- Application filed larch 29, 1930. Serial No. 439,892,

My invention relates to means to protect the edges of glass photographic plates which are used in connection with an electric lamp, the illumination from which passes through the glass and showsthe picture; and more particularly to plates known as depthographs which are the subject matter of- United States Letters Patent issued March 26, 1918, to Clarence W. Kanolt, No. 1,260,- 682.

lin displaying depthographs, in addition to the positive plate it is necessary to employ a lined screen which is carried on a second plate. In handling these plates, it not infrequently occurs that a small piece of glass is chipped out of an edge. This of itself is harmless, but when the plate is subjected to the intense heat developed by the modern gas filled electric lamp bulbs, it frequently causes the-chip to start a crack which runs clear across the plate, thereby rendering it useless and resulting in expensive loss.

My invention has for its object, to provide a metal binding for the edges of the plates, which will be spaced therefrom, so that no matter if the binding is struck it will be improbable that the shock would be transmitted to the edges of the glass plates.

' h/ly invention has for its further object,to construct the binding so that it will clamp or bind the plates firmly together.

A concrete embodiment of my invention is illustrated in the accompanying drawing, which is to be'considered as a part of this specification, in which' Fig. 1 is a front elevation of my device;

Fig.2 is a side elevation of the same;

Fig. 3 is a cross-section, taken on line 3-3 in Fig. 1, as indicated by the arrows; and

Fig. l is a cross-section ot the binding before the insertion of the glass plates.

Similar reference numerals refer to simi-' lar parts throughout the entire description. As shown in the drawing, the glass plates 1 and 2 are provided with a metal binding 3, which extendslongitudinally of the plate edges on each of the four sides. This metal binding 3 consists of a channel formed of a base and two side walls, the base being wider than the thickness of the plates to be bound,

so as to-extend beyond the outer surfaces of the plates when in position. As clearly seen in-the sectional 'view, Fig. 3, the sides 4 and 5 of the channel are shaped so that there are spaces 6 and 7 between the corners 8 and 9 of the edges of the plates 1 and 2.

Both sides 4 and 5 of the channel incline inwardly toward the plates. The side 5 of the channel is wider than the side 4, and its,

edge is curved slightly outwardly and away from the point where it meets the surface. of the plate 1, to facilitate placing the binding 3 on the plates and detaching it therefrom. The opposite side 4 of the channel .is inclined towards the surface of the plate 2 and engages it with the edge of the channel, the space intermediate the two side walls being less than the thickness of the plates,

so that the sides 4 and 5 have tobe spread apart to insert the plates. This is accomplished by tipping the plates" 1 and 2, as indicated by the dotted lines in Fig. 3, when they can be inserted in the channel and then straightened to the position shown in full lines. This puts the side Walls 4: and 5 of the channel under a tension, due to the resiliency of the material employed, with the result that the plates 1 and 2 are clamped tightly together, leaving the spaces 6 and 7 to protect their edges.

' Although I have described the binding as being formed of metal, and the plates as being glass plates, I do not wish tobe understood as limiting myself specifically to the kinds of material herein named, as my inventlon is not confined to any particular material.

Having described my invention, what I at the top of the narrow wall bein less than the th ckness of the plates, the ace of the channels being wider than the thickness of the plates, whereby said channels are spaced 5 from the corners of the edges of said plates and from the edges thereof when in position. 2. Abinding for less plates comprising two pairs of metal a annels, one pair being y longer than the edges of the plates to which 10 they are applied, the shorterv pair being longer than the edges of the plates to which they are applied thereby spacing-the bottom of said channels from the edges of the plates jhaving a base, a narrow and a wide side wall, thebase bein wider than the thickness of the plates to la: bound the walls being inclined inwardly, the edge of'the wide wall curving outwardly where it meets the surface of the plate to be bound, there-bein a space between the edges of the plates an the outer corners of said edges of the channels when the channels are in place.

25 ERNEST E. DRAPER. 

